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Title: A broadband gyrotron backward-wave oscillator with tapered interaction structure and magnetic field

The gyro-monotron and gyrotron backward-wave oscillator (gyro-BWO) are the two oscillator versions of gyrotrons. While serving different functions, they are also radically different in the RF field formation mechanisms. The gyro-monotron RF field profile is essentially fixed by the resonant interaction structure, while the gyro-BWO possesses an extra degree of freedom in that the axial RF field profile is self-determined by the beam-wave interaction in a waveguide structure. The present study examines ways to utilize the latter feature for bandwidth broadening with a tapered magnetic field, while also employing a tapered waveguide to enhance the interaction efficiency. We begin with a mode competition analysis, which suggests the theoretical feasibility of broadband frequency tuning in single-mode operation. It is then shown in theory that, by controlling the RF field profile with an up- or down-tapered magnetic field, the gyro-BWO is capable of efficient operation with a much improved tunable bandwidth.
Authors:
; ; ; ; ; ; ; ;  [1] ; ;  [2]
  1. Department of Physics, National Taiwan University, Taipei 106, Taiwan (China)
  2. Wave Power Technology, 232 Youyi Road, Zhunan, Miaoli, Taiwan (China)
Publication Date:
OSTI Identifier:
22489861
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 11; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; DEGREES OF FREEDOM; EFFICIENCY; FREQUENCY SELECTION; INTERACTIONS; MAGNETIC FIELDS; MICROWAVE AMPLIFIERS; OSCILLATORS; WAVEGUIDES